Here’s a video from the Automotivedreams YouTube channel. The comments are in Italian, but the images speak for themselves. This is part 1. Part 2 can be found on the Museo Storico page.
On the same page you’ll find a slideshow from the hiddes treasures in the basement of the museum. A number of these cars are subject of the book Alfavelate (‘veiled Alfas’) by Gippo Salvetti, Fucina Editore, ISBN 978-88-88269-31-1. The pictures in the book are different from those in the slideshow, but both absolutely worth viewing.